package com.sky.service.impl;

import com.github.pagehelper.Page;
import com.github.pagehelper.PageHelper;
import com.sky.constant.MessageConstant;
import com.sky.constant.StatusConstant;
import com.sky.dto.SetmealDTO;
import com.sky.dto.SetmealPageQueryDTO;
import com.sky.entity.Dish;
import com.sky.entity.Setmeal;
import com.sky.entity.SetmealDish;
import com.sky.exception.DeletionNotAllowedException;
import com.sky.mapper.DishMapper;
import com.sky.mapper.SetmealDishMapper;
import com.sky.mapper.SetmealMapper;
import com.sky.result.PageResult;
import com.sky.service.SetmealService;
import com.sky.vo.DishItemVO;
import com.sky.vo.SetmealVO;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import java.util.List;

@Service
public class SetmealServiceImpl implements SetmealService {

    @Autowired
    private SetmealMapper setmealMapper;

    @Autowired
    private SetmealDishMapper setmealDishMapper;

    @Autowired
    private DishMapper dishMapper;


    /**
     * 新增套餐
     * @param setmealDTO
     */
    @Override
    @Transactional
    public void saveWithDish(SetmealDTO setmealDTO) {

        Setmeal setmeal = new Setmeal();

        // 对象拷贝
        BeanUtils.copyProperties(setmealDTO, setmeal);

        // 修改两张表 开启事务
        // 1.修改套餐表
        setmealMapper.insert(setmeal);

        // 获取套餐id
        Long setmealId = setmeal.getId();

        // 获取套餐中的菜品 可能有多个 将前面获取的套餐id设置给套餐菜品表中的每一个菜品
        List<SetmealDish> setmealDishes = setmealDTO.getSetmealDishes();
        setmealDishes.forEach(setmealDish -> {
            setmealDish.setSetmealId(setmealId);
        });

        // 2.修改套餐菜品表
        setmealDishMapper.insertBatch(setmealDishes);

    }

    /**
     * 套餐分页查询
     * @param setmealPageQueryDTO
     * @return
     */
    @Override
    public PageResult pageQuery(SetmealPageQueryDTO setmealPageQueryDTO) {
        PageHelper.startPage(setmealPageQueryDTO.getPage(), setmealPageQueryDTO.getPageSize());
        Page<SetmealVO> page = setmealMapper.pageQuery(setmealPageQueryDTO);
        return new PageResult(page.getTotal(), page.getResult());
    }

    /**
     * 批量删除套餐
     * @param ids
     */
    @Transactional
    @Override
    public void deleteBatch(List<Long> ids) {

        // 判断当前套餐是否起售，起售中的套餐不能删除
        for (Long id : ids) {
            Setmeal setmeal = setmealMapper.getById(id);
            if (setmeal.getStatus() == StatusConstant.ENABLE) {
                throw new DeletionNotAllowedException(MessageConstant.SETMEAL_ON_SALE);
            }
        }

        for (Long id : ids) {
            // 删除套餐同时删除套餐菜品表中的数据
            setmealMapper.deleteBatch(id);

            // 删除套餐中所关联的菜品
            setmealDishMapper.deleteBySetmealId(id);
        }

    }

    /**
     * 起售 停售
     * @param status
     * @param id
     */
    @Override
    public void startOrStop(Integer status, Long id) {

        Setmeal setmeal = Setmeal.builder()
                .status(status)
                .id(id)
                .build();

        setmealMapper.update(setmeal);

    }

    /**
     * 根据id查询
     * @param id
     * @return
     */
    @Override
    public SetmealVO getById(Long id) {

        // 查套餐信息
        Setmeal setmeal = setmealMapper.getById(id);

        // 查套餐菜品信息
        List<SetmealDish> setmealDishes = setmealDishMapper.getBySetmealId(id);

        // 封装套餐信息和菜品信息
        SetmealVO setmealVO = new SetmealVO();
        BeanUtils.copyProperties(setmeal, setmealVO);
        setmealVO.setSetmealDishes(setmealDishes);

        return setmealVO;
    }

    /**
     * 修改套餐
     * @param setmealDTO
     */
    @Override
    public void update(SetmealDTO setmealDTO) {

        // 更新套餐信息
        Setmeal setmeal = new Setmeal();
        BeanUtils.copyProperties(setmealDTO, setmeal);
        setmealMapper.update(setmeal);

        // 更新套餐关联菜品
        // 先删除菜品信息
        setmealDishMapper.deleteBySetmealId(setmealDTO.getId());

        // 获取新的菜品信息
        List<SetmealDish> setmealDishes = setmealDTO.getSetmealDishes();
        if (setmealDishes != null && setmealDishes.size() > 0) {
            setmealDishes.forEach(dish -> dish.setSetmealId(setmealDTO.getId()));
            // 插入新的菜品信息
            setmealDishMapper.insertBatch(setmealDishes);
        }
    }

    /**
     * 条件查询
     * @param setmeal
     * @return
     */
    public List<Setmeal> list(Setmeal setmeal) {
        List<Setmeal> list = setmealMapper.list(setmeal);
        return list;
    }

    /**
     * 根据id查询菜品选项
     * @param id
     * @return
     */
    public List<DishItemVO> getDishItemById(Long id) {
        return setmealMapper.getDishItemBySetmealId(id);
    }
}
